Question

I have a function void get(boost::function<void(void)> callback) { callback(); }.
I want to make a call like get(boost::bind(/* don't know what to put here*/)); without implementing any other functions, variables or structs, so that the callback does nothing.
Is it possible to implement such “no-op” callback in C++03 ?

Usage of boost::bind() is prefered but not required – may be, there are some other tricks to achieve my goal.

Answer 1

You could use something like boost::bind(std::plus<int>(), 0, 0), which should be optimised away to nothing.

It would make the code rather clearer if you relaxed your restriction and defined a no-op functor instead.